Some demonstrative embodiments include apparatuses, devices, systems and methods of wireless transmission over a bonded channel. For example, a wireless station may be configured to determine a Clear Channel Assessment (CCA) busy state of a secondary channel in a directional wireless communication band upon detecting transmission of a first packet over the secondary channel; to determine a CCA idle state of the secondary channel upon detecting transmission of a second packet indicating an end of a transmission sequence including the first packet; and to process transmission of a wireless transmission over a bonded channel including a primary channel and the secondary channel, if the CCA state of the secondary channel and a CCA state of the primary channel are idle during at least a back-off and an InterFrame Space (IFS).